[EMG characteristics of women in respect with phase of the menstrual cycle, season and type of vegetative regulation].

Here we report on the electromyographic (EMG) characteristics of young females (n = 23, 19.9 +/- 1.4 years) under varied environmental and physical conditions: 4 phases of menstrual cycle phase (early and late follicular, ovulation, and luteal), spring and autumn seasons, and type of the vegetative nervous system (VNS) regulation based on the linear and novel non-linear parameters of interference EMG (iEMG) in m.

[The thermoregulating function of the motor units in the muscles of the pelvic floor of the cat].

An interaction between supraspinal respiratory input and the thermoafferent one in the pelvic floor muscles' motor units depended on the body temperature. The data obtained suggest that the thermoregulatory activity in the pelvic floor muscles affect the so called expulsive acts (defecation etc.) followed by the muscle relaxation.

[The characteristics of the impulse activity of the motor units of the muscles in the pelvic floor in the cat].

The investigation have been designed to elucidate the background and thermoregulatory activity (TA) of the motor units (MUs) of pelvic floor muscles (m. spincter ani externus, m. levator ani) and hind limb muscle (m.

[Interaction of thermoreceptive and vestibular signalling in regulating the activity of flexor and extensor motor nuclei during cold tremor].

The impulse activity of flexor and extensor gamma- and alpha-motoneurons was investigated in anesthetized cats during cold tremor. Total cooling, local cold stimulation of thermoreceptors or electrical stimulation of dorsomedial area of posterior hypothalamus were shown to evoke primary activation of flexor--and simultaneous inhibition of extensor gamma-motoneurons, with secondary activation of flexor alpha-motoneurons. Caloric stimulation of the vestibular receptors during cold tremor evokes primary inhibition of the activity of flexor alpha-motoneurons and secondary inhibition of flexor gamma-motoneurons as well as simultaneous activation of extensor gamma-motoneurons.

[Effect of SH-reagents on aldehyde dehydrogenase activity of the rat liver].

SH-reagents: tetraethylthiuram disulphide (TETD), 5,5'-dithiobisnitrobenzoic acid (DTNB), p-chloromercurybenzoate (p-ChMB), N-ethylmaleimide (NEM) were studied for their effect on the aldehyde dehydrogenase activity of mitochondrion (isoenzymes I and II) and microsome (isoenzyme II) fractions of the rat liver. TETD is established to inhibit isoenzyme I and isoenzyme II activity of mitochondrial aldehyde dehydrogenase by 100 and 50%, respectively, and the microsomal enzyme activity by 20%. DTNB and NEM inhibit 30-50% of the activity in two isoforms of mitochondrial aldehyde dehydrogenase having no effect on the enzymic activity in microsomes; p-ChMB inhibits completely the activity of the enzyme under study both in the mitochondrial and microsomal fractions.

[Subcellular distribution and properties of aldehyde dehydrogenase in the rat liver].

The subcellular distribution and certain properties of rat liver aldehyde dehydrogenase are investigated. The enzyme is shown to be localized in fractions of mitochondria and microsomes. Optimal conditions are chosen for detecting the aldehyde dehydrogenase activity in the mentioned fractions.

[Participation of the vestibular apparatus in regulating shivering].

Participation of the vestibular apparatus in the control of bioelectrical activity and function of muscle motor units was studied in experiments on cats with cold shivering. It was shown that the shivering was suppressed by limitation of the vestibulospinal effects whereas stimulation of the vestibular apparatus enhanced it. Suppression of the shivering after delabyrinthation manifested both in the increased frequencies of impulses in the active motor units and in the recruitment of new units, previously "silent".

[Bioelectrical activity of limb muscles during shivering while stimulating the vestibular apparatus].

The effects of caloric and electric stimulation of the vestibular receptors on the EMG activity of limb muscles in anesthetized cats during cold-induced shivering involved flexor muscles alone. Both types of stimulation suppressed bioelectrical activity, more effectivey in the ipsilateral muscles. The suppression of shivering activity seems to be due to the increased inhibitory effect of descending labyrinth pathways on the function of flexor motoneurons.